Renault says it will focus more on race performance at the next F1 test in Barcelona and was thoroughly satisfied with the developments made in Jerez this week.

The French supplier, who power Red Bull and Toro Rosso in F1, said after a successful Jerez test they will look to refine the power units to a similar specification to what will be used at the first race of the season in Melbourne next month.

"With our targets generally hit, we can look forward to the next test in Barcelona," Remi Taffin, Renault Sport's director of operations, said. "We want to move more to the performance aspect of the power unit in this test and run in a specification closer to that we will run in Melbourne, of course still keeping a very close eye on reliability."

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The supplier confirmed its power unit, the Renault Energy F1-2015, covered over 2,400km from the two teams combination of laps in the four day test - equivalent to eight race distances.

Renault hopes to move on from a disappointing 2014 with its all-new power unit and Taffin confirmed the team has made great progress.

"We've wiped the slate clean this year and have new, aggressive targets. This week was the first step and we have hit nearly all the objectives we set ourselves," he said.

"The primary goals were to fully integrate the power unit into our partners' chassis, eliminate the gremlins and then run as much as possible. We can be relatively satisfied at this stage. The Toro Rosso has been running particularly well and is representative of the mileage we need to achieve this season."

However, Taffin admitted Jerez hadn't been a perfect four days for Renault because of the level of work required on the brand new design.

During the test, the two team's running time was seriously hampered due to problems with a small metallic shaft related to the Renault ERS water pump, which Renault managing director Cyril Abiteboul called 'a stupid part'.

"There have been some teething troubles, which have arisen largely because we have been so uncompromising with our aims over the winter," Taffin said. "The energy store in particular was being run as aggressively as we could, but we need to explore the limits of the parts in Barcelona to know how far we can push them.

"Likewise, a water pump issue was due to a relatively young part we tested on track rather than running extensively in the dyno - we are conscious that we need to pull out all the stops. We have learnt a lot from the running and have now put in place measures to prevent any further problems of this nature going forward."